Tax deadlines in Luxembourg
The dates below are the filing calendar published by the Administration des contributions directes. They are dates, not tax advice: your own situation can carry a different deadline.
Upcoming dates
December 2026
- Deadline: 2025 income tax return (form 100)
- Deadline: annual statement (décompte annuel) for 2025
Frequently asked questions
Where do these deadlines come from?
From the filing calendar published by the Administration des contributions directes. We copy the published dates and link back to them; we do not compute a deadline for you.
Does the same deadline apply to everyone?
No. The published deadline is the general one; extensions and different rules exist depending on your situation. Check with the administration or your adviser before relying on a date.
Can I be reminded before the deadline?
Add this calendar with the button at the top of the page. With an Avuru Finance account you can also switch on a reminder a day or two before each date.